Burglar-alarm.



R. A. PHILP. BURGLAR ALARM.

APPLICATION FILED MAY 12, 1913.

1,091,385. Patented Mar.24,191

Ii iw 7 8% ,453 3 MW,

ROBERT A. PHILP, OF PORTLAND, OREGON.

BURGLAR-ALARM.

Specification of Letters Patent.

Application filed May 12, 1913.

Patented Mar. 24, 1914.

Serial No. 767,168.

. To all whom it may concern Be it known that I, ROBERT A. PmLr, a citizen of the United States, residing at Portland, in the county of Multnomah and State of Oregon, have invented certain new and useful Improvements in Burglar- Alarms; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention comprehends improvements in burglar alarms and relates more particularly to those which are operated by the opening of a door.

The primary object of the invention resides in the provision of a burglar alarm, which shall be of extremely simple construction, cheap to manufacture, and very reliable.

Another and more specific object of the invention is to provide a burglar alarmincluding a main frame adapted to engage a door and a floor, a bell mounted on the main frame, sounding mechanism, and means engaging the door for the purpose of setting the sounding mechanism in motion when the door is opened.

lVith these and other objects in view, as will become more apparent as the description proceeds, the invention consists in certain novel features of construction, combination, and arrangement of parts, as will be hereinafter described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawings, in which,

Figure 1 is a side elevation of my alarm, showing the same in position ready for use, parts of the device being shown in section, and, Fig. 2 is a front elevation with the bell removed and the support therefor shown in section.

In the preferred embodiment of my invention, I provide a main frame including the side rods 5, which are pointed at their ends for the purpose of engagement with a floor and door. The side rods extend in parallel relationship to each other and are connected by a plurality of cross rods 6 which are looped at their ends into engagement with the same. A bell 7 is supported on the main frame by an annular member which includes the downwardly and outwardly diverging arms 8 secured at their lower ends to the innermost cross rods 6 intermediate their ends. The bell is sounded by a clapper 9 which may be actuated by any suitable means housed within the casing 10, said means including the ratchet wheel 11. The casing is supported by a secondary frame which includes the vertical side strips 12 connected at their upper ends to the side rods 5 of the main frame, and horizontal strips 13 extending from adja cent the lower extremities of the vertical strips 12 and secured at their forward ends to prongs 14:, which latter are attached to the side bars 5. Supporting strips 15 extend inwardly from the lower extremities of the vertical strips 12 and are connected to the casing 10, whereby the same is supported. The prongs 1d are pointed at their free extremities and are adapted to engage the floor when the device is in position for use.

A trip rod 16 is supported in a horizontal plane by a guide bracket 17 secured to the casing 10 and projects into said casing through an opening 18 to engage a pawl 19, which normally holds the ratchet wheel against movement so that the clapper 9 remains idle. The outer end of the trip rod is formed with a head 20, which is adapted to engage a door.

To prevent the ends of the side rods 5 from slipping upwardly along the door 21, when the same is forced inwardly, I provide a door plate 22 having upwardly extending portions 23 which are provided with a plurality of vertically alincd openings 24. A flange 25 is formed upon the lower edge of the door plate and by engaging the lower edge of the door prevents the plate from moving upwardly.

In positioning my device, the upper ends of the side rods 5 are inserted through certain of the openings 2 f formed in the plate 22 and the lower ends are engaged with the floor. The prongs 1 1 are also engaged with the floor and act as braces for the main frame. The trip rod 16 must bear against the door and it is therefore necessary that the extremities of the side bars 5 be inserted through the proper openings 24:.

\Vhen an attempt is made to open the door 21, the pointed extremities of the side rods 5 are forced into the same and into the floor and permit a slight movement of the former, which forces the trip rod against the pawl 19, releasing the same from the ratchet wheel 11, whereupon the clapper is actuated and sounds the alarm. It will be seen that the door plate 22 is supported by the rods 5 and prevents the same slipping upwardly along the door.

From the foregoing description taken in connection with the accompanying drawings, it will be seen that I have provided a burglar alarm which is of extremely simple construction, which may be easily applied to any door so that the opening of the same will sound the alarm, and which is of such design as to be easily carried by travelers.

It is to be understood that while I have shown and described the preferred embodiment of my invention, I do not wish to be limited to this exact construction, combination, and arrangement of parts, but may make such changes as will fall within the spirit and scope of the invention.

Having thus described my invention, what I claim is l. A. burglar alarm comprising a frame formed of a pair of side rods sharpened attheir extremities for engagement with a door and a floor, and a plurality of cross rods connecting said side rods in spaced parallel relation, a bell mounted on the upper side of the frame, a sounding mechanism located under the frame for ringing the bell, and a longitudinally movable trip member for setting the sounding mechanism in operation when an attempt is made to open the door, said trip member extending at right angles to the door and having an enlarged end for engagement therewith.

2. A burglar alarm including a main frame comprising a pair of side rods sharpened at their extremities for engagement with a door and a floor, and a plurality of transverse rods connecting said side rods in spaced parallel relation, a bell mounted above the main frame, a supplemental frame suspended from the main frame, a casing carried by the supplemental frame, alarm mechanism partly housed within said casing and adapted to sound the bell, a guide formed upon the casing on the side opposed to the door, a longitudinally movable rod slidable through said guide, extending at right angles to the door, and formed with an enlargement upon one end for engagement with said door, and means operated by the trip rod for setting the alarm mechanism in operation when an attempt is made to open the door.

3. A burglar alarm having a frame including side bars sharpened at their extremities for engagement with a door and a supporting surface, respectively, alarm mechanism supported by the frame and including a ratchetwheel, a pawl engaging said ratchet wheel and a longitudinally movable trip rod for releasing the pawl from the ratchet wheel, whereby the alarm mechanism is set in operation, said trip rod extending at right angles to the door and adapted to be forced toward the pawl when the door is opened.

4. The combination with a supporting surface and a door, of a burglar alarm including a frame having sharpened extremities for engagement with the supporting surface and door, said frame forming an acute angle with both members, an alarm mechanism carried by the frame, a trip rod extending at right angles to the door and engaging the same, the inward movement of said trip rod releasing the alarm mechanism, and an apertured door plate through which the upper extremities of the frame project, said plate preventing an upward movement of the frame relative to the door when the latter is opened.

In testimony whereof I affix my signature in presence of two witnesses.

ROBERT A. PHILP.

Witnesses H. A. PITTENGER, J. F. I-IILL.

Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of Eatente. Washington, D. G. 

